Tire



P 1932- D. J. CAMPBELL 1,879,790

TIRE

2 Sheets-Sheet 1 Original Filed Jan. 20, 1930 all Cmu ub Sept. 27, 1932.D. J. CAMPBELL TIRE 2 Sheets-Sheet 2 Original Filed; Jan. 20 1930 lllillil llfllllllllll llllllfi lllllll Patented Sept. 27, 1932 ranger I EDS TES PATENT oFFlCef DONALD J. CAMPBELL, or .MusKEeoN iI-IEIGHTS,MICHIGAN TIRE Application filed January 20, 1930, Serial Ho. 421,885.Renewed anuary 20, 1932.

This'invention relates totires and is more concerned with detachablejandreplaceable treads for pneumatic tires which: are used chiefly on heavymotor vehicles such as trucks or the like. h c 7 It is a primary objectand purpose of the present invention to provide detachable andreplaceable tread for pneumatic tire casings, whereby when a treadbecomes worn toa point where its usefulnessis done it maybe readilydetached and removed from the easing and replaced by a new tread. In thematter of detachably securing-the tread to the tire casing, it isessential that the treadwhen applied, to the casing shall not movesidewise or laterally, that it shall not creep around the casing andthat it shall not-pull or move outwardly away from the tire ,casl ing;and the present invention is concerned with suitable means forpreventing any such undesired movements of the tread. The

means used forthus securing the tread to the casing furthermore must besuch that it can be removed. to free the tread and detach it from thecasing; and my invention is directed to simple, practical and eificientmeans for securing; these ends, understanding of which may be had fromthe following'description, taken in connection with the accompanying 3Odrawing, in which, 7 Fig. 1 is a side elevationof a tire casing equippedwith my invention, certain parts being broken away and shown'in sectionfor a better disclosure of the invention. V

Fig. 2 is a transverse section through the casing.

Fig. 3 is a fragmentary longitudinalsection through the tire casing andtread at the point where thetread lockingmeans has-its ends comingtogether. i

Fig. 4 is afra-gmentaryplan of the tire casing and showing thelocking-member used. therewith, the tread being removed. 1

Fig. 5 is a fragmentary side elevation, 4 partly lIl V N form ofconstruction of the t re casingsand tread and means which may be usedfor hold ing the tread against outward movement away from the casing. IFlg. 6 1s a fragmentary transverse section section, illustrative of adifiere'nt through the tread and easing, the section be ing takensubstantially concentric with the center of thetire. c

c Fig. 7 is. a fragmentary cross sectionthrough the tire casing andtread as shown in Fig. 5 with the parts separated, and,

. F: g. 8 is a similar section showing fthe parts secured together. 7 r

Like reference characters refer to, likeparts-in the different figuresof the drawing.

. The casing l of the tire has an outer fiat side 2 on which, as shownin Figs. 1 and 4, a plurality of. spaced apart transverse ribs 3 aremade similartothe teeth ofa gear and atone point, as indicated at 4:, awider rib is provided, the purpose of which will later be explained, r V

The tread. 5 ofrubber at its inner side is. provided with a consecutiveplurality ;of spaced apart cross ribs 5f which are adapted. tofit in thespaces between the ribs '3. onthe tire casing. {The inner side ofthetread is, s also formed atone point withv a-widerjspace to receive thewider rib 4 on thecasingwhere bythe tread can be applied/to the casingonly in one position, that .in which the ribet Will enter therecessprovidedJforit on the inner; sideof the tread. 1 :An opening 7 ismade throughthe outer wall 2 of the tire casing. A continuous annulargroove is made around the outerside of the casing 1 and the inner sideof. the tread 5 indicated at '8 substantially midway between the endsofthe ribs 3 and 6. This groove gradually tapersfromone end to theotherand in the same a 'continuous lockin key 9 isadapted to belocatedafter the tread hasfbeen'positioned'over the casing in properrelation thereto. The key ,orlocking mem ber 9, whi ch maybehofrubberofgsomewhat harder'c'o'nsistency than wartime ofthe tread, istapered to"c'orrespond, with the groove 8 in which it is received, thenarrower end beingins'ertedinto the wider endof. the grtove through the.opening land the key forced around through the groove which it willfollow readily by'reason ofthe tapered 7 character of the groove andof-the key or. locking member, until the outer end ofthe key at 10enters the opening 7 The opposite ends of the key or looking member arecut on V inclines, indicated at 11 and 12, whereby when A filler block14 is used to fill the remainder;

of the opening 7 through which a screw 15 passes to screw into thesleeve 13 thereby locking the key in lace and providing a smoothunbroken 'sur aceat thexin'ner side of the tirecasing.

With the locking key 9'in place the tread is held against sidewisemovementwith re-.

spect to thecasingon which it is'placed while the engagement of the ribs3and G'precludes any creeping of the tread around the casing. When atread has become worn and is to be replaced it is necessary only toremovethe screw 15 and filler block 14, whereupon the locking key 9. maybe readily withdrawn, freeing the tread for sidewise movement which willdisengage it from'the casing. In

, practice any suitable material such" as powcred" soap stone or thelike may be used between the casing and tread and dusted into the groove8 so that vulcanizationoftlie parts or sticking togetherwill not occur.I v

InlFigs'. 5 t 0 8, inclusive, a different form of construction is shown.The casing. 1 has aflat outer side 2a'on the outerside of which aplurality of projections 16 are made'con neoted together at one end andtapering to points at their oppositeends. The tread5a has cooperatinginwardly extending projec tions 17 of similar form but reversed as toposition whereby thefprojections 17 may fit between the projections 16on the casing. The outer wider-ends of the projections 16 and l7 arecontinuous as indicated at 18 provid-ing a substantially continuous ribas shown. A plurality of bolts 19,which in practice are made fromlengths of flexibletwisted wire having welded ends, one formed with ahead and the other screw threaded to receive a nut, may be used toextend transversely across and between the outer side 01 the tire casingand the inner side ofthe tread,

5 metal plates 20 bearingagainst the sides of 1 together by means oftapering plugs 21 having screw threadedfpro ections22 which extend intoand pass throughtapered recesses 23 in the outer side of thecasingadapted to.

fit the tapered plugs 21 while the threaded.

= projections 22 screwintothethreaded'sock ets 24 in the inner side ofthe tread thereby locking the tread against movement with re spect tothe casing either laterally in an outly available for, use with heavyduty tires wherein the treads wear more rapidly than the remainder ofthe tire deteriorates so that itis desirable that the tread may bereplaced by a; new one; to-obtain the full service value of the tirecasing. The beads of the casing may be provided with spaced apartoutward- 1y extending radial ribs 25 to engage in suitable recesses in aWheel rim to hold the entire tire against creeping. The invention isdefined inthe appended claims and is to be considered 7 comprehensive ofall forms of structure coming within their scope.

I claim:

1.. A tire construction comprising a tire casing, a separable continuoustread around the casing, interengaging means on the adj'acent sides ofthe tire-and casing for bold ing the tread againstcreeping movement, anda continuous locking key adapted to'be inserted from inside the casingthrough the same and between the casing and tread for holding the treadagainst lateral movement with respect to the casing. v i

2. A tire construction comprising, a tire casing, a separable continuoustread adapted to be" detachably applied to and around the casing, saidtread and casing at adjacent sides.

having complementary grooves thereby forming a continuous opening aroundand between the same, a locking key receivedin the opening between thecasing and tread after-the tread has been applied in place, saidcasingat one pointat its inner side'having a passage to-said continuousopening'for the inserton or removal of the locking key.

Y 3. A construction containing. the elements incombinationdefined inclaim 2, the end portions of said locking key being adapted to overlapthereby making acontinuou's'locking member filling said continuousopening,

apart of the passage in the casing to saidopening being filled by oneend portion of said locking key, a locking block filling the remainderof said-"passage, and means for detachably securingv said locking blockto the other end portion of the key.

*4. A construction containing the elements in combination defined inclaim 2, said continuous opening around the tire between the casing andtreadbeing'continuously tapered andpro'gressively' reduced in size, andSaid locking keybeing; of likeand complementary form owherebyitssmallerend may be introduced'into larger end of; the opening'a'nd;readily inserted thereth reugh 1 and thereby completely fill thetrodu'cedth'ereinto; v o o o o v -5. A tire construction comprising. atire passage when wholly in-- casing, a separable tread adapted to bedetachably applied to and around the casing, said tread and casing atadjacent sides having complementary grooves thereby forming a continuousopening around and between the same, a locking key received in theopening between the casing and tread after the tread has been applied inplace, said casing at one point at its inner side having a passage tosaid continuous opening for the insertion or removal of the locking key,and means for holding said locking key in position.

6. A tire construction comprising a tire casing, a separable treadaround the casing, means on the adjacent sides of the tire and casingfor holding the tread against creeping movement, and a continuouslocking key adapted to be inserted from inside the casing through thesame and between the casing and tread for holding the tread againstlateral movement with respect to the casing.

7. A tire construction comprising a tire casing, a separable treadaround the casing, and a continuous locking key adapted to be insertedfrom inside the casing through the same and between the casing and treadfor holding the tread against lateral movement with respect to thecasing.

8. A tire construction comprising a tire casing, a separable treadaround the casing, a separable continuous locking key adapted to beinserted between the casing and tread for holding the tread againstlateral movement with respect to the casing, and means on the key toprevent any circumferential movement thereof.

9. A tire construction comprising a tire casing having a continuousannular groove therearound and a passage leading into the casing, aseparable tread around the casing, a continuous locking key adapted tobe inserted in said annular groove between the casing and tread forholding the tread against lateral movement with respect to the casing,the end portions of said locking key being adapted to overlap therebymaking a continuous locking member filling said continuous annulargroove, a part of the passage in the casing to said opening being filledby one end portion of said locking key, a locking block filling theremainder of said'passage, and means for detachably securing saidlocking block to the other end portion of the key.

10. A tire construction comprising a tire casing having a continuousgroove therearound, a tread around the casing, a locking key adapted tobe inserted in said groove between the casing and tread, said continuouspassage when wholly introgroove around the tire between the casing andtread being continuously tapered and progressively reduced in size, andsaid looking key being of like and complementary form whereby itssmaller end may be introduced into larger end of the opening and readilyinserted therethrough and thereby

